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editor_rulers.cc

/*
    Copyright (C) 2000 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: editor_rulers.cc,v 1.52 2005/06/21 21:23:50 sampo Exp $
*/

#include <cstdio> // for sprintf, grrr 
#include <cmath>

#include <string>

#include <ardour/tempo.h>
#include <gtkmmext/gtk_ui.h>

#include "editor.h"
#include "editing.h"
#include "gtk-custom-hruler.h"
#include "gui_thread.h"

#include "i18n.h"

using namespace SigC;
using namespace ARDOUR;
using namespace Gtk;
using namespace Editing;

Editor *Editor::ruler_editor;

/* the order here must match the "metric" enums in editor.h */

GtkCustomMetric Editor::ruler_metrics[4] = {
      {1, Editor::_metric_get_smpte },
      {1, Editor::_metric_get_bbt },
      {1, Editor::_metric_get_frames },
      {1, Editor::_metric_get_minsec }
};

void
Editor::initialize_rulers ()
{
      ruler_editor = this;
      ruler_grabbed_widget = 0;
      
      _smpte_ruler = gtk_custom_hruler_new ();
      smpte_ruler = wrap (_smpte_ruler);
      smpte_ruler->set_name ("SMPTERuler");
      smpte_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_smpte_ruler), &ruler_metrics[ruler_metric_smpte]);
      ruler_shown[ruler_metric_smpte] = true;
      
      _bbt_ruler = gtk_custom_hruler_new ();
      bbt_ruler = wrap (_bbt_ruler);
      bbt_ruler->set_name ("BBTRuler");
      bbt_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_bbt_ruler), &ruler_metrics[ruler_metric_bbt]);
      ruler_shown[ruler_metric_bbt] = true;

      _frames_ruler = gtk_custom_hruler_new ();
      frames_ruler = wrap (_frames_ruler);
      frames_ruler->set_name ("FramesRuler");
      frames_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_frames_ruler), &ruler_metrics[ruler_metric_frames]);

      _minsec_ruler = gtk_custom_hruler_new ();
      minsec_ruler = wrap (_minsec_ruler);
      minsec_ruler->set_name ("MinSecRuler");
      minsec_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_minsec_ruler), &ruler_metrics[ruler_metric_minsec]);

      ruler_shown[ruler_time_meter] = true;
      ruler_shown[ruler_time_tempo] = true;
      ruler_shown[ruler_time_marker] = true;
      ruler_shown[ruler_time_range_marker] = true;
      ruler_shown[ruler_time_transport_marker] = true;
      ruler_shown[ruler_metric_frames] = false;
      ruler_shown[ruler_metric_minsec] = false;
      
      smpte_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
      bbt_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
      frames_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
      minsec_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);

      smpte_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));
      bbt_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));
      frames_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));
      minsec_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));

      smpte_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      bbt_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      frames_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      minsec_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      
      smpte_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      bbt_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      frames_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      minsec_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      
      visible_timebars = 7; /* 4 here, 3 in time_canvas */
      ruler_pressed_button = 0;
}


gint
Editor::ruler_button_press (GdkEventButton* ev)
{
      if (session == 0) {
            return FALSE;
      }

      ruler_pressed_button = ev->button;

      // jlc: grab ev->window ?
      //Gtk::Main::grab_add (*minsec_ruler);
      Widget * grab_widget = 0;

      if (smpte_ruler->is_realized() && ev->window == smpte_ruler->get_window()) grab_widget = smpte_ruler;
      else if (bbt_ruler->is_realized() && ev->window == bbt_ruler->get_window()) grab_widget = bbt_ruler;
      else if (frames_ruler->is_realized() && ev->window == frames_ruler->get_window()) grab_widget = frames_ruler;
      else if (minsec_ruler->is_realized() && ev->window == minsec_ruler->get_window()) grab_widget = minsec_ruler;

      if (grab_widget) {
            Gtk::Main::grab_add (*grab_widget);
            ruler_grabbed_widget = grab_widget;
      }

      return TRUE;
}

gint
Editor::ruler_button_release (GdkEventButton* ev)
{
      gint x,y;
      GdkModifierType state;

      /* need to use the correct x,y, the event lies */
      time_canvas_event_box.get_window().get_pointer (x, y, state);


      ruler_pressed_button = 0;
      
      if (session == 0) {
            return FALSE;
      }

      hide_verbose_canvas_cursor();
      stop_canvas_autoscroll();
      
      jack_nframes_t where = leftmost_frame + pixel_to_frame (x);

      switch (ev->button) {
      case 1:
            /* transport playhead */
            snap_to (where);
            session->request_locate (where);
            break;

      case 2:
            /* edit cursor */
            if (snap_type != Editing::SnapToEditCursor) {
                  snap_to (where);
            }
            edit_cursor->set_position (where);
            edit_cursor_clock.set (where);
            break;

      case 3:
            /* popup menu */
            snap_to (where);
            popup_ruler_menu (where);
            
            break;
      default:
            break;
      }


      if (ruler_grabbed_widget) {
            Gtk::Main::grab_remove (*ruler_grabbed_widget);
            ruler_grabbed_widget = 0;
      }

      return TRUE;
}

gint
Editor::ruler_label_button_release (GdkEventButton* ev)
{
      if (ev->button == 3)
      {
            popup_ruler_menu();
      }
      
      return TRUE;
}


gint
Editor::ruler_mouse_motion (GdkEventMotion* ev)
{
      if (session == 0 || !ruler_pressed_button) {
            return FALSE;
      }

      double wcx=0,wcy=0;
      double cx=0,cy=0;

      gint x,y;
      GdkModifierType state;

      /* need to use the correct x,y, the event lies */
      time_canvas_event_box.get_window().get_pointer (x, y, state);

      
      gtk_canvas_window_to_world (GTK_CANVAS(track_gtk_canvas), x, y, &wcx, &wcy);
      gtk_canvas_w2c_d (GTK_CANVAS(track_gtk_canvas), wcx, wcy, &cx, &cy);
      
      jack_nframes_t where = leftmost_frame + pixel_to_frame (x);

      /// ripped from maybe_autoscroll
      jack_nframes_t one_page = (jack_nframes_t) rint (canvas_width * frames_per_unit);
      jack_nframes_t rightmost_frame = leftmost_frame + one_page;

      jack_nframes_t frame = pixel_to_frame (cx);

      if (autoscroll_timeout_tag < 0) {
            if (frame > rightmost_frame) {
                  if (rightmost_frame < max_frames) {
                        start_canvas_autoscroll (1);
                  }
            } else if (frame < leftmost_frame) {
                  if (leftmost_frame > 0) {
                        start_canvas_autoscroll (-1);
                  }
            } 
      } else {
            if (frame >= leftmost_frame && frame < rightmost_frame) {
                  stop_canvas_autoscroll ();
            }
      }
      //////      
      
      snap_to (where);

      Cursor* cursor = 0;
      
      switch (ruler_pressed_button) {
      case 1:
            /* transport playhead */
            cursor = playhead_cursor;
            break;

      case 2:
            /* edit cursor */
            cursor = edit_cursor;
            break;

      default:
            break;
      }

      if (cursor)
      {
            cursor->set_position (where);
            
            if (cursor == edit_cursor) {
                  edit_cursor_clock.set (where);
            }
            
            show_verbose_time_cursor (where, 10, cx, 0);
      }
      
      return TRUE;
}


void
Editor::popup_ruler_menu (jack_nframes_t where, ItemType t)
{
      using namespace Menu_Helpers;

      if (editor_ruler_menu == 0) {
            editor_ruler_menu = new Menu;
            editor_ruler_menu->set_name ("ArdourContextMenu");
      }

      // always build from scratch
      MenuList& ruler_items = editor_ruler_menu->items();
      editor_ruler_menu->set_name ("ArdourContextMenu");
      ruler_items.clear();

      CheckMenuItem * mitem;

      no_ruler_shown_update = true;

      switch (t) {
      case MarkerBarItem:
            ruler_items.push_back (MenuElem (_("New location marker"), bind ( slot (*this, &Editor::mouse_add_new_marker), where)));
            ruler_items.push_back (MenuElem (_("Clear all locations"), slot (*this, &Editor::clear_markers)));
            ruler_items.push_back (SeparatorElem ());
            break;
      case RangeMarkerBarItem:
            //ruler_items.push_back (MenuElem (_("New Range")));
            ruler_items.push_back (MenuElem (_("Clear all ranges"), slot (*this, &Editor::clear_ranges)));
            ruler_items.push_back (SeparatorElem ());

            break;
      case TransportMarkerBarItem:

            break;
            
      case TempoBarItem:
            ruler_items.push_back (MenuElem (_("New Tempo"), bind ( slot (*this, &Editor::mouse_add_new_tempo_event), where)));
            ruler_items.push_back (MenuElem (_("Clear tempo")));
            ruler_items.push_back (SeparatorElem ());
            break;

      case MeterBarItem:
            ruler_items.push_back (MenuElem (_("New Meter"), bind ( slot (*this, &Editor::mouse_add_new_meter_event), where)));
            ruler_items.push_back (MenuElem (_("Clear meter")));
            ruler_items.push_back (SeparatorElem ());
            break;

      default:
            break;
      }
      
      ruler_items.push_back (CheckMenuElem (_("Min:Secs"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_metric_minsec)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_metric_minsec]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (X_("SMPTE"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_metric_smpte)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_metric_smpte]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (_("Frames"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_metric_frames)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_metric_frames]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (_("Bars:Beats"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_metric_bbt)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_metric_bbt]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (SeparatorElem ());

      ruler_items.push_back (CheckMenuElem (_("Meter"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_time_meter)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_time_meter]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (_("Tempo"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_time_tempo)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_time_tempo]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (_("Location Markers"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_time_marker)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_time_marker]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (_("Range Markers"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_time_range_marker)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_time_range_marker]) {
            mitem->set_active(true);
      }

      ruler_items.push_back (CheckMenuElem (_("Loop/Punch Ranges"), bind (slot (*this, &Editor::ruler_toggled), (int)ruler_time_transport_marker)));
      mitem = (CheckMenuItem *) ruler_items.back(); 
      if (ruler_shown[ruler_time_transport_marker]) {
            mitem->set_active(true);
      }
      
        editor_ruler_menu->popup (1, 0);

      no_ruler_shown_update = false;
}

void
Editor::ruler_toggled (int ruler)
{
      if (!session) return;
      if (ruler < 0 || ruler >= (int) sizeof(ruler_shown)) return;

      if (no_ruler_shown_update) return;

      if (ruler_shown[ruler]) {
            if (visible_timebars <= 1) {
                  // must always have 1 visible
                  return;
            }
      }
      
      ruler_shown[ruler] = !ruler_shown[ruler];

      update_ruler_visibility ();

      // update session extra RulerVisibility
      store_ruler_visibility ();
}

void
Editor::store_ruler_visibility ()
{
      XMLNode* node = new XMLNode(X_("RulerVisibility"));

      node->add_property (X_("smpte"), ruler_shown[ruler_metric_smpte] ? "yes": "no");
      node->add_property (X_("bbt"), ruler_shown[ruler_metric_bbt] ? "yes": "no");
      node->add_property (X_("frames"), ruler_shown[ruler_metric_frames] ? "yes": "no");
      node->add_property (X_("minsec"), ruler_shown[ruler_metric_minsec] ? "yes": "no");
      node->add_property (X_("tempo"), ruler_shown[ruler_time_tempo] ? "yes": "no");
      node->add_property (X_("meter"), ruler_shown[ruler_time_meter] ? "yes": "no");
      node->add_property (X_("marker"), ruler_shown[ruler_time_marker] ? "yes": "no");
      node->add_property (X_("rangemarker"), ruler_shown[ruler_time_range_marker] ? "yes": "no");
      node->add_property (X_("transportmarker"), ruler_shown[ruler_time_transport_marker] ? "yes": "no");

      session->add_extra_xml (*node);
      session->set_dirty ();
}
 
void 
Editor::restore_ruler_visibility ()
{
      XMLProperty* prop;
      XMLNode * node = session->extra_xml (X_("RulerVisibility"));

      if (node) {
            if ((prop = node->property ("smpte")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_metric_smpte] = true;
                  else 
                        ruler_shown[ruler_metric_smpte] = false;
            }
            if ((prop = node->property ("bbt")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_metric_bbt] = true;
                  else 
                        ruler_shown[ruler_metric_bbt] = false;
            }
            if ((prop = node->property ("frames")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_metric_frames] = true;
                  else 
                        ruler_shown[ruler_metric_frames] = false;
            }
            if ((prop = node->property ("minsec")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_metric_minsec] = true;
                  else 
                        ruler_shown[ruler_metric_minsec] = false;
            }
            if ((prop = node->property ("tempo")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_time_tempo] = true;
                  else 
                        ruler_shown[ruler_time_tempo] = false;
            }
            if ((prop = node->property ("meter")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_time_meter] = true;
                  else 
                        ruler_shown[ruler_time_meter] = false;
            }
            if ((prop = node->property ("marker")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_time_marker] = true;
                  else 
                        ruler_shown[ruler_time_marker] = false;
            }
            if ((prop = node->property ("rangemarker")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_time_range_marker] = true;
                  else 
                        ruler_shown[ruler_time_range_marker] = false;
            }
            if ((prop = node->property ("transportmarker")) != 0) {
                  if (prop->value() == "yes") 
                        ruler_shown[ruler_time_transport_marker] = true;
                  else 
                        ruler_shown[ruler_time_transport_marker] = false;
            }

      }

      update_ruler_visibility ();
}


void
Editor::update_ruler_visibility ()
{
      using namespace Box_Helpers;
      BoxList & lab_children =  time_button_vbox.children();
      BoxList & ruler_children =  time_canvas_vbox.children();

      visible_timebars = 0;

      lab_children.clear();

      // leave the last one (the time_canvas_scroller) intact
      while (ruler_children.size() > 1) {
            ruler_children.pop_front();
      }

      BoxList::iterator canvaspos = ruler_children.begin();
      
      _smpte_ruler = gtk_custom_hruler_new ();
      smpte_ruler = wrap (_smpte_ruler);
      smpte_ruler->set_name ("SMPTERuler");
      smpte_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_smpte_ruler), &ruler_metrics[ruler_metric_smpte]);
      
      _bbt_ruler = gtk_custom_hruler_new ();
      bbt_ruler = wrap (_bbt_ruler);
      bbt_ruler->set_name ("BBTRuler");
      bbt_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_bbt_ruler), &ruler_metrics[ruler_metric_bbt]);

      _frames_ruler = gtk_custom_hruler_new ();
      frames_ruler = wrap (_frames_ruler);
      frames_ruler->set_name ("FramesRuler");
      frames_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_frames_ruler), &ruler_metrics[ruler_metric_frames]);

      _minsec_ruler = gtk_custom_hruler_new ();
      minsec_ruler = wrap (_minsec_ruler);
      minsec_ruler->set_name ("MinSecRuler");
      minsec_ruler->set_usize (-1, (int)timebar_height);
      gtk_custom_ruler_set_metric (GTK_CUSTOM_RULER(_minsec_ruler), &ruler_metrics[ruler_metric_minsec]);

      
      smpte_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
      bbt_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
      frames_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
      minsec_ruler->set_events (GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);

      smpte_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));
      bbt_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));
      frames_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));
      minsec_ruler->button_release_event.connect (slot (*this, &Editor::ruler_button_release));

      smpte_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      bbt_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      frames_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      minsec_ruler->button_press_event.connect (slot (*this, &Editor::ruler_button_press));
      
      smpte_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      bbt_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      frames_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));
      minsec_ruler->motion_notify_event.connect (slot (*this, &Editor::ruler_mouse_motion));

      
      if (ruler_shown[ruler_metric_minsec]) {
            lab_children.push_back (Element(minsec_label, false, false));
            ruler_children.insert (canvaspos, Element(*minsec_ruler, false, false));
            visible_timebars++;
      }

      if (ruler_shown[ruler_metric_smpte]) {
            lab_children.push_back (Element(smpte_label, false, false));
            ruler_children.insert (canvaspos, Element(*smpte_ruler, false, false));
            visible_timebars++;
      }

      if (ruler_shown[ruler_metric_frames]) {
            lab_children.push_back (Element(frame_label, false, false));
            ruler_children.insert (canvaspos, Element(*frames_ruler, false, false));
            visible_timebars++;
      }

      if (ruler_shown[ruler_metric_bbt]) {
            lab_children.push_back (Element(bbt_label, false, false));
            ruler_children.insert (canvaspos, Element(*bbt_ruler, false, false));
            visible_timebars++;
      }

      double tbpos = 0.0;
      double old_unit_pos ;
      GtkArg args[1] ;
      args[0].name = "y";
      
      if (ruler_shown[ruler_time_meter]) {
            lab_children.push_back (Element(meter_label, false, false));

            gtk_object_getv (GTK_OBJECT(meter_group), 1, args) ;
            old_unit_pos = GTK_VALUE_DOUBLE (args[0]) ;
            if (tbpos != old_unit_pos) {
                  gtk_canvas_item_move (meter_group, 0.0, tbpos - old_unit_pos) ;
            }

            //gtk_canvas_item_set (meter_group, "y", tbpos, NULL);
            gtk_canvas_item_show (meter_group);
            tbpos += timebar_height;
            visible_timebars++;
      }
      else {
            gtk_canvas_item_hide (meter_group);
      }
      
      if (ruler_shown[ruler_time_tempo]) {
            lab_children.push_back (Element(tempo_label, false, false));
            gtk_object_getv (GTK_OBJECT(tempo_group), 1, args) ;
            old_unit_pos = GTK_VALUE_DOUBLE (args[0]) ;
            if (tbpos != old_unit_pos) {
                  gtk_canvas_item_move (tempo_group, 0.0, tbpos - old_unit_pos) ;
            }
            //gtk_canvas_item_set (tempo_group, "y", tbpos, NULL);
            gtk_canvas_item_show (tempo_group);
            tbpos += timebar_height;
            visible_timebars++;
      }
      else {
            gtk_canvas_item_hide (tempo_group);
      }
      
      if (ruler_shown[ruler_time_marker]) {
            lab_children.push_back (Element(mark_label, false, false));
            gtk_object_getv (GTK_OBJECT(marker_group), 1, args) ;
            old_unit_pos = GTK_VALUE_DOUBLE (args[0]) ;
            if (tbpos != old_unit_pos) {
                  gtk_canvas_item_move (marker_group, 0.0, tbpos - old_unit_pos) ;
            }
            //gtk_canvas_item_set (marker_group, "y", tbpos, NULL);
            gtk_canvas_item_show (marker_group);
            tbpos += timebar_height;
            visible_timebars++;
      }
      else {
            gtk_canvas_item_hide (marker_group);
      }
      
      if (ruler_shown[ruler_time_range_marker]) {
            lab_children.push_back (Element(range_mark_label, false, false));
            gtk_object_getv (GTK_OBJECT(range_marker_group), 1, args) ;
            old_unit_pos = GTK_VALUE_DOUBLE (args[0]) ;
            if (tbpos != old_unit_pos) {
                  gtk_canvas_item_move (range_marker_group, 0.0, tbpos - old_unit_pos) ;
            }
            //gtk_canvas_item_set (marker_group, "y", tbpos, NULL);
            gtk_canvas_item_show (range_marker_group);
            tbpos += timebar_height;
            visible_timebars++;
      }
      else {
            gtk_canvas_item_hide (range_marker_group);
      }

      if (ruler_shown[ruler_time_transport_marker]) {
            lab_children.push_back (Element(transport_mark_label, false, false));
            gtk_object_getv (GTK_OBJECT(transport_marker_group), 1, args) ;
            old_unit_pos = GTK_VALUE_DOUBLE (args[0]) ;
            if (tbpos != old_unit_pos) {
                  gtk_canvas_item_move (transport_marker_group, 0.0, tbpos - old_unit_pos) ;
            }
            //gtk_canvas_item_set (marker_group, "y", tbpos, NULL);
            gtk_canvas_item_show (transport_marker_group);
            tbpos += timebar_height;
            visible_timebars++;
      }
      else {
            gtk_canvas_item_hide (transport_marker_group);
      }
      
      time_canvas_vbox.set_usize (-1, (int)(timebar_height * visible_timebars));
      time_canvas_event_box.queue_resize();
      
      update_fixed_rulers();
      //update_tempo_based_rulers();
      tempo_map_changed(Change (0));

      time_canvas_event_box.show_all();
      time_button_event_box.show_all();
}

void
Editor::update_just_smpte ()
{
      ENSURE_GUI_THREAD(slot (*this, &Editor::update_just_smpte));
      
      if (session == 0) {
            return;
      }

      /* XXX Note the potential loss of accuracy here as we convert from
         an uint32_t (or larger) to a float ... what to do ?
      */

      jack_nframes_t page = (jack_nframes_t) floor (canvas_width * frames_per_unit);
      jack_nframes_t rightmost_frame = leftmost_frame + page;

      if (ruler_shown[ruler_metric_smpte]) {
            gtk_custom_ruler_set_range (GTK_CUSTOM_RULER(_smpte_ruler), leftmost_frame, rightmost_frame,
                                  leftmost_frame, session->current_end_frame());
      }
}

void
Editor::update_fixed_rulers ()
{
      jack_nframes_t rightmost_frame;

      if (session == 0) {
            return;
      }

      /* XXX Note the potential loss of accuracy here as we convert from
         an uint32_t (or larger) to a float ... what to do ?
      */

      jack_nframes_t page = (jack_nframes_t) floor (canvas_width * frames_per_unit);

      ruler_metrics[ruler_metric_smpte].units_per_pixel = frames_per_unit;
      ruler_metrics[ruler_metric_frames].units_per_pixel = frames_per_unit;
      ruler_metrics[ruler_metric_minsec].units_per_pixel = frames_per_unit;

      rightmost_frame = leftmost_frame + page;

      /* these force a redraw, which in turn will force execution of the metric callbacks
         to compute the relevant ticks to display.
      */

      if (ruler_shown[ruler_metric_smpte]) {
            gtk_custom_ruler_set_range (GTK_CUSTOM_RULER(_smpte_ruler), leftmost_frame, rightmost_frame,
                                  leftmost_frame, session->current_end_frame());
      }
      
      if (ruler_shown[ruler_metric_frames]) {
            gtk_custom_ruler_set_range (GTK_CUSTOM_RULER(_frames_ruler), leftmost_frame, rightmost_frame,
                                  leftmost_frame, session->current_end_frame());
      }
      
      if (ruler_shown[ruler_metric_minsec]) {
            gtk_custom_ruler_set_range (GTK_CUSTOM_RULER(_minsec_ruler), leftmost_frame, rightmost_frame,
                                  leftmost_frame, session->current_end_frame());
      }
}           

void
Editor::update_tempo_based_rulers ()
{
      if (session == 0) {
            return;
      }

      /* XXX Note the potential loss of accuracy here as we convert from
         an uint32_t (or larger) to a float ... what to do ?
      */

      jack_nframes_t page = (jack_nframes_t) floor (canvas_width * frames_per_unit);
      ruler_metrics[ruler_metric_bbt].units_per_pixel = frames_per_unit;

      if (ruler_shown[ruler_metric_bbt]) {
            gtk_custom_ruler_set_range (GTK_CUSTOM_RULER(_bbt_ruler), leftmost_frame, leftmost_frame+page, 
                                  leftmost_frame, session->current_end_frame());
      }
}

/* Mark generation */

gint
Editor::_metric_get_smpte (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      return ruler_editor->metric_get_smpte (marks, lower, upper, maxchars);
}

gint
Editor::_metric_get_bbt (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      return ruler_editor->metric_get_bbt (marks, lower, upper, maxchars);
}

gint
Editor::_metric_get_frames (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      return ruler_editor->metric_get_frames (marks, lower, upper, maxchars);
}

gint
Editor::_metric_get_minsec (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      return ruler_editor->metric_get_minsec (marks, lower, upper, maxchars);
}

gint
Editor::metric_get_smpte (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      jack_nframes_t range;
      jack_nframes_t pos;
      jack_nframes_t spacer;
      jack_nframes_t fr;
      SMPTE_Time smpte;
      gchar buf[16];
      gint nmarks = 0;
      gint n;
      bool show_bits = false;
      bool show_frames = false;
      bool show_seconds = false;
      bool show_minutes = false;
      bool show_hours = false;
      int mark_modulo;

      if (session == 0) {
            return 0;
      }

      fr = session->frame_rate();

      if (lower > (spacer = (jack_nframes_t)(128 * Editor::get_current_zoom ()))) {
            lower = lower - spacer;
      } else {
            upper = upper + spacer - lower;
            lower = 0;
      }
      range = upper - lower;

      if (range < (2 * session->frames_per_smpte_frame())) { /* 0 - 2 frames */
            show_bits = true;
            mark_modulo = 20;
            nmarks = 1 + 160;
      } else if (range <= (fr / 4)) { /* 2 frames - 0.250 second */
            show_frames = true;
            mark_modulo = 1;
            nmarks = 1 + (range / (jack_nframes_t)session->frames_per_smpte_frame());
      } else if (range <= (fr / 2)) { /* 0.25-0.5 second */
            show_frames = true;
            mark_modulo = 2;
            nmarks = 1 + (range / (jack_nframes_t)session->frames_per_smpte_frame());
      } else if (range <= fr) { /* 0.5-1 second */
            show_frames = true;
            mark_modulo = 5;
            nmarks = 1 + (range / (jack_nframes_t)session->frames_per_smpte_frame());
      } else if (range <= 2 * fr) { /* 1-2 seconds */
            show_frames = true;
            mark_modulo = 10;
            nmarks = 1 + (range / (jack_nframes_t)session->frames_per_smpte_frame());
      } else if (range <= 8 * fr) { /* 2-8 seconds */
            show_seconds = true;
            mark_modulo = 1;
            nmarks = 1 + (range / fr);
      } else if (range <= 16 * fr) { /* 8-16 seconds */
            show_seconds = true;
            mark_modulo = 2;
            nmarks = 1 + (range / fr);
      } else if (range <= 30 * fr) { /* 16-30 seconds */
            show_seconds = true;
            mark_modulo = 5;
            nmarks = 1 + (range / fr);
      } else if (range <= 60 * fr) { /* 30-60 seconds */
            show_seconds = true;
            mark_modulo = 5;
            nmarks = 1 + (range / fr);
      } else if (range <= 2 * 60 * fr) { /* 1-2 minutes */
            show_seconds = true;
            mark_modulo = 20;
            nmarks = 1 + (range / fr);
      } else if (range <= 4 * 60 * fr) { /* 2-4 minutes */
            show_seconds = true;
            mark_modulo = 30;
            nmarks = 1 + (range / fr);
      } else if (range <= 10 * 60 * fr) { /* 4-10 minutes */
            show_minutes = true;
            mark_modulo = 2;
            nmarks = 1 + 10;
      } else if (range <= 30 * 60 * fr) { /* 10-30 minutes */
            show_minutes = true;
            mark_modulo = 5;
            nmarks = 1 + 30;
      } else if (range <= 60 * 60 * fr) { /* 30 minutes - 1hr */
            show_minutes = true;
            mark_modulo = 10;
            nmarks = 1 + 60;
      } else if (range <= 4 * 60 * 60 * fr) { /* 1 - 4 hrs*/
            show_minutes = true;
            mark_modulo = 30;
            nmarks = 1 + (60 * 4);
      } else if (range <= 8 * 60 * 60 * fr) { /* 4 - 8 hrs*/
            show_hours = true;
            mark_modulo = 1;
            nmarks = 1 + 8;
      } else if (range <= 16 * 60 * 60 * fr) { /* 16-24 hrs*/
            show_hours = true;
            mark_modulo = 1;
            nmarks = 1 + 24;
      } else {
    
            /* not possible if jack_nframes_t is a 32 bit quantity */
    
            show_hours = true;
            mark_modulo = 4;
            nmarks = 1 + 24;
      }
  
      pos = lower;

      *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);  
      
      if (show_bits) {
            // Find smpte time of this sample (pos) with subframe accuracy
            session->sample_to_smpte(pos, smpte, true /* use_offset */, true /* use_subframes */ );
    
            for (n = 0; n < nmarks; n++) {
                  session->smpte_to_sample(smpte, pos, true /* use_offset */, true /* use_subframes */ );
                  if ((smpte.subframes % mark_modulo) == 0) {
                        if (smpte.subframes == 0) {
                              (*marks)[n].style = GtkCustomRulerMarkMajor;
                              snprintf (buf, sizeof(buf), "%s%02ld:%02ld:%02ld:%02ld", smpte.negative ? "-" : "", smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
                        } else {
                              (*marks)[n].style = GtkCustomRulerMarkMinor;
                              snprintf (buf, sizeof(buf), ".%02ld", smpte.subframes);
                        }
                  } else {
                        snprintf (buf, sizeof(buf)," ");
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
        
                  }
                  (*marks)[n].label = g_strdup (buf);
                  (*marks)[n].position = pos;

                  // Increment subframes by one
                  session->smpte_increment_subframes( smpte );
            }
      } else if (show_seconds) {
            // Find smpte time of this sample (pos)
            session->sample_to_smpte(pos, smpte, true /* use_offset */, false /* use_subframes */ );
            // Go to next whole second down
            session->smpte_seconds_floor( smpte );

            for (n = 0; n < nmarks; n++) {
                  session->smpte_to_sample(smpte, pos, true /* use_offset */, false /* use_subframes */ );
                  if ((smpte.seconds % mark_modulo) == 0) {
                        if (smpte.seconds == 0) {
                              (*marks)[n].style = GtkCustomRulerMarkMajor;
                              (*marks)[n].position = pos;
                        } else {
                              (*marks)[n].style = GtkCustomRulerMarkMinor;
                              (*marks)[n].position = pos;
                        }
                        snprintf (buf, sizeof(buf), "%s%02ld:%02ld:%02ld:%02ld", smpte.negative ? "-" : "", smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
                  } else {
                        snprintf (buf, sizeof(buf)," ");
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
                        (*marks)[n].position = pos;
        
                  }
                  (*marks)[n].label = g_strdup (buf);
                  session->smpte_increment_seconds( smpte );
            }
      } else if (show_minutes) {
            // Find smpte time of this sample (pos)
            session->sample_to_smpte(pos, smpte, true /* use_offset */, false /* use_subframes */ );
            // Go to next whole minute down
            session->smpte_minutes_floor( smpte );

            for (n = 0; n < nmarks; n++) {
                  session->smpte_to_sample(smpte, pos, true /* use_offset */, false /* use_subframes */ );
                  if ((smpte.minutes % mark_modulo) == 0) {
                        if (smpte.minutes == 0) {
                              (*marks)[n].style = GtkCustomRulerMarkMajor;
                        } else {
                              (*marks)[n].style = GtkCustomRulerMarkMinor;
                        }
                        snprintf (buf, sizeof(buf), "%s%02ld:%02ld:%02ld:%02ld", smpte.negative ? "-" : "", smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
                  } else {
                        snprintf (buf, sizeof(buf)," ");
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
        
                  }
                  (*marks)[n].label = g_strdup (buf);
                  (*marks)[n].position = pos;
                  session->smpte_increment_minutes( smpte );
            }
      } else if (show_hours) {
            // Find smpte time of this sample (pos)
            session->sample_to_smpte(pos, smpte, true /* use_offset */, false /* use_subframes */ );
            // Go to next whole hour down
            session->smpte_hours_floor( smpte );

            for (n = 0; n < nmarks; n++) {
                  session->smpte_to_sample(smpte, pos, true /* use_offset */, false /* use_subframes */ );
                  if ((smpte.hours % mark_modulo) == 0) {
                        (*marks)[n].style = GtkCustomRulerMarkMajor;
                        snprintf (buf, sizeof(buf), "%s%02ld:%02ld:%02ld:%02ld", smpte.negative ? "-" : "", smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
                  } else {
                        snprintf (buf, sizeof(buf)," ");
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
        
                  }
                  (*marks)[n].label = g_strdup (buf);
                  (*marks)[n].position = pos;

                  session->smpte_increment_hours( smpte );
            }
      } else { // show_frames
            // Find smpte time of this sample (pos)
            session->sample_to_smpte(pos, smpte, true /* use_offset */, false /* use_subframes */ );
            // Go to next whole frame down
            session->smpte_frames_floor( smpte );

            for (n = 0; n < nmarks; n++) {
                  session->smpte_to_sample(smpte, pos, true /* use_offset */, false /* use_subframes */ );
                  if ((smpte.frames % mark_modulo) == 0)  {
                        (*marks)[n].style = GtkCustomRulerMarkMajor;
                        (*marks)[n].position = pos;
                        snprintf (buf, sizeof(buf), "%s%02ld:%02ld:%02ld:%02ld", smpte.negative ? "-" : "", smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
                  } else {
                        snprintf (buf, sizeof(buf)," ");
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
                        (*marks)[n].position = pos;
        
                  }
                  (*marks)[n].label = g_strdup (buf);
                  session->smpte_increment( smpte );
            }
      }
  
      return nmarks;
}


gint
Editor::metric_get_bbt (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
        if (session == 0) {
                return 0;
        }

        TempoMap::BBTPointList::iterator i;
      TempoMap::BBTPointList *zoomed_bbt_points;
        uint32_t beats = 0;
        uint32_t bars = 0;
      uint32_t tick = 0;
      uint32_t skip;
      uint32_t t;
        uint32_t zoomed_beats = 0;
        uint32_t zoomed_bars = 0;
        uint32_t desirable_marks;
      uint32_t magic_accent_number = 1;
      gint nmarks;
        char buf[64];
        gint n;
      jack_nframes_t pos;
        jack_nframes_t frame_one_beats_worth;
        jack_nframes_t frame_skip;
      double frame_skip_error;
      double accumulated_error;
        bool bar_helper_on = true;

       
      BBT_Time previous_beat;
      BBT_Time next_beat;
      jack_nframes_t next_beat_pos;

            if ((desirable_marks = maxchars / 6) == 0) {
               return 0;
        }

        /* align the tick marks to whatever we're snapping to... */
                                                                                                             
        if (snap_type == SnapToAThirdBeat) {
                bbt_beat_subdivision = 3;
        } else if (snap_type == SnapToAQuarterBeat) {
                bbt_beat_subdivision = 4;
        } else if (snap_type == SnapToAEighthBeat) {
                bbt_beat_subdivision = 8;
            magic_accent_number = 2;
        } else if (snap_type == SnapToASixteenthBeat) {
                bbt_beat_subdivision = 16;
            magic_accent_number = 4;
        } else if (snap_type == SnapToAThirtysecondBeat) {
                bbt_beat_subdivision = 32;
            magic_accent_number = 8;
        } else {
             bbt_beat_subdivision = 4;
      }

      /* First find what a beat's distance is, so we can start plotting stuff before the beginning of the ruler */

      session->bbt_time(lower,previous_beat);
      previous_beat.ticks = 0;
      next_beat = previous_beat;

      if (session->tempo_map().meter_at(lower).beats_per_bar() < (next_beat.beats + 1)) {
             next_beat.bars += 1;
             next_beat.beats = 1;
      } else {
             next_beat.beats += 1;
      }

      frame_one_beats_worth = session->tempo_map().frame_time(next_beat) - session->tempo_map().frame_time(previous_beat);


      zoomed_bbt_points = session->tempo_map().get_points((lower >= frame_one_beats_worth) ? lower - frame_one_beats_worth : 0, upper);

      if (current_bbt_points == 0 || zoomed_bbt_points == 0 || zoomed_bbt_points->empty()) {
            return 0;
      }

      for (i = current_bbt_points->begin(); i != current_bbt_points->end(); i++) {
            if ((*i).type == TempoMap::Beat) {
                  beats++;
            } else if ((*i).type == TempoMap::Bar) {
                  bars++;
            }
      }
      /*Only show the bar helper if there aren't many bars on the screen */
      if (bars > 1) {
              bar_helper_on = false;
      }

      for (i = zoomed_bbt_points->begin(); i != zoomed_bbt_points->end(); i++) {
                  if ((*i).type == TempoMap::Beat) {
                        zoomed_beats++;
                  } else if ((*i).type == TempoMap::Bar) {
                        zoomed_bars++;
                  }
            }

      if (desirable_marks > (beats / 4)) {

            /* we're in beat land...*/

            double position_of_helper;
            bool i_am_accented = false;
            bool we_need_ticks = false;
      
            position_of_helper = lower + (30 * Editor::get_current_zoom ());

            if (desirable_marks >= (beats * 2)) {
                        nmarks = (zoomed_beats * bbt_beat_subdivision) + 1;
                  we_need_ticks = true;
            } else {
                  nmarks = zoomed_beats + 1;
            }

            *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);

            (*marks)[0].label = g_strdup(" ");
            (*marks)[0].position = lower;
            (*marks)[0].style = GtkCustomRulerMarkMicro;
            
            for (n = 1, i = zoomed_bbt_points->begin(); i != zoomed_bbt_points->end() && n < nmarks; ++i) {
            
                  if ((*i).frame <= lower && (bar_helper_on)) {
                  
                              snprintf (buf, sizeof(buf), "<%" PRIu32 "|%" PRIu32, (*i).bar, (*i).beat);
                              (*marks)[0].label = g_strdup (buf); 
                  } else {

             
                    if ((*i).type == TempoMap::Bar)  {
                      tick = 0;
                      (((*i).frame < position_of_helper) && bar_helper_on) ?
                        snprintf (buf, sizeof(buf), " ") : snprintf (buf, sizeof(buf), "%" PRIu32, (*i).bar);
                      (*marks)[n].label = g_strdup (buf);
                      (*marks)[n].position = (*i).frame;
                      (*marks)[n].style = GtkCustomRulerMarkMajor;
                      n++;
                      
                    } else if (((*i).type == TempoMap::Beat) && ((*i).beat > 1)) {
                      tick = 0;
                      ((((*i).frame < position_of_helper) && bar_helper_on) || !we_need_ticks) ?
                        snprintf (buf, sizeof(buf), " ") : snprintf (buf, sizeof(buf), "%" PRIu32, (*i).beat);
                      if (((*i).beat % 2 == 1) || we_need_ticks) {
                        (*marks)[n].style = GtkCustomRulerMarkMinor;
                      } else {
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
                      }
                      (*marks)[n].label =  g_strdup (buf);
                      (*marks)[n].position = (*i).frame;
                      n++;
                    }

                  }
                  /* Find the next beat */
                  
                  session->bbt_time((*i).frame, next_beat);

                  if (session->tempo_map().meter_at((*i).frame).beats_per_bar() > (next_beat.beats + 1)) {
                    next_beat.beats += 1;
                  } else {
                    next_beat.bars += 1;
                    next_beat.beats = 1;
                  }
            
                  next_beat_pos = session->tempo_map().frame_time(next_beat);

                  /* Add the tick marks */

                  if (we_need_ticks) {

                                frame_skip = (jack_nframes_t) floor ((session->frame_rate() *  60) / (bbt_beat_subdivision * (*i).tempo->beats_per_minute()));
                          frame_skip_error =  ((session->frame_rate() *  60.0f) / (bbt_beat_subdivision * (*i).tempo->beats_per_minute())) - frame_skip;
                          skip = (uint32_t) (Meter::ticks_per_beat / bbt_beat_subdivision);

                        pos = (*i).frame + frame_skip;
                        accumulated_error = frame_skip_error;

                        tick += skip;

                        for (t = 0; tick < Meter::ticks_per_beat && pos <= next_beat_pos ; pos += frame_skip, tick += skip, ++t) {

                              if (t % magic_accent_number == (magic_accent_number - 1)) {
                                    i_am_accented = true;
                              }
                              if (Editor::get_current_zoom () > 32) {
                                    snprintf (buf, sizeof(buf), " ");
                              } else if ((Editor::get_current_zoom () > 8) && !i_am_accented) {
                                    snprintf (buf, sizeof(buf), " ");
                              } else  if (bar_helper_on && (pos < position_of_helper)) {
                                    snprintf (buf, sizeof(buf), " ");
                              } else {
                                    snprintf (buf, sizeof(buf), "%" PRIu32, tick);
                              }

                              (*marks)[n].label = g_strdup (buf);

                              /* Error compensation for float to jack_nframes_t*/
                              accumulated_error += frame_skip_error;
                                if (accumulated_error > 1) {
                                      pos += 1;
                                    accumulated_error -= 1.0f;
                              }

                              (*marks)[n].position = pos;

                              if ((bbt_beat_subdivision > 4) && i_am_accented) {
                                    (*marks)[n].style = GtkCustomRulerMarkMinor;
                              } else {
                                    (*marks)[n].style = GtkCustomRulerMarkMicro;
                              }
                              i_am_accented = false;
                              n++;
                        
                        }
                  }
            }
            delete zoomed_bbt_points;
            return n; //return the actual number of marks made, since we might have skipped some fro fractional time signatures 

       } else {

            /* we're in bar land */

            if (desirable_marks < (uint32_t) (zoomed_bars / 256)) {
                  nmarks = 1;
                  *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
                  snprintf (buf, sizeof(buf), "too many bars... (currently %" PRIu32 ")", zoomed_bars );
                  (*marks)[0].style = GtkCustomRulerMarkMajor;
                  (*marks)[0].label = g_strdup (buf);
                  (*marks)[0].position = lower;
            } else if (desirable_marks < (uint32_t) (nmarks = (gint) (zoomed_bars / 64))) {
                  *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
                  for (n = 0, i = zoomed_bbt_points->begin(); i != zoomed_bbt_points->end() && n < nmarks; i++) {
                        if ((*i).type == TempoMap::Bar)  {
                              if ((*i).bar % 64 == 1) {
                                    if ((*i).bar % 256 == 1) {
                                          snprintf (buf, sizeof(buf), "%" PRIu32, (*i).bar);
                                          (*marks)[n].style = GtkCustomRulerMarkMajor;
                                    } else {
                                          snprintf (buf, sizeof(buf), " ");
                                          if ((*i).bar % 256 == 129)  {
                                                (*marks)[n].style = GtkCustomRulerMarkMinor;
                                          } else {
                                                (*marks)[n].style = GtkCustomRulerMarkMicro;
                                          }
                                    }
                                    (*marks)[n].label = g_strdup (buf);
                                    (*marks)[n].position = (*i).frame;
                                    n++;
                              }
                        }
                  }
            } else if (desirable_marks < (uint32_t) (nmarks = (gint)(zoomed_bars / 16))) {
                  *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
                  for (n = 0, i = zoomed_bbt_points->begin(); i != zoomed_bbt_points->end() && n < nmarks; i++) {
                        if ((*i).type == TempoMap::Bar)  {
                              if ((*i).bar % 16 == 1) {
                                    if ((*i).bar % 64 == 1) {
                                          snprintf (buf, sizeof(buf), "%" PRIu32, (*i).bar);
                                          (*marks)[n].style = GtkCustomRulerMarkMajor;
                                    } else {
                                          snprintf (buf, sizeof(buf), " ");
                                          if ((*i).bar % 64 == 33)  {
                                                (*marks)[n].style = GtkCustomRulerMarkMinor;
                                          } else {
                                                (*marks)[n].style = GtkCustomRulerMarkMicro;
                                          }
                                    }
                                    (*marks)[n].label = g_strdup (buf);
                                    (*marks)[n].position = (*i).frame;
                                    n++;
                              }
                        }
                  }
            } else if (desirable_marks < (uint32_t) (nmarks = (gint)(zoomed_bars / 4))){
                  *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
                  for (n = 0, i = zoomed_bbt_points->begin(); i != zoomed_bbt_points->end() && n < nmarks; ++i) {
                        if ((*i).type == TempoMap::Bar)  {
                              if ((*i).bar % 4 == 1) {
                                    if ((*i).bar % 16 == 1) {
                                          snprintf (buf, sizeof(buf), "%" PRIu32, (*i).bar);
                                          (*marks)[n].style = GtkCustomRulerMarkMajor;
                                    } else {
                                          snprintf (buf, sizeof(buf), " ");
                                          if ((*i).bar % 16 == 9)  {
                                                (*marks)[n].style = GtkCustomRulerMarkMinor;
                                          } else {
                                                (*marks)[n].style = GtkCustomRulerMarkMicro;
                                          }
                                    }
                                    (*marks)[n].label = g_strdup (buf);
                                    (*marks)[n].position = (*i).frame;
                                    n++;
                              }
                        }
                  }
            } else {
                  nmarks = zoomed_bars;
                  *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
                  for (n = 0, i = zoomed_bbt_points->begin(); i != zoomed_bbt_points->end() && n < nmarks; i++) {
                              if ((*i).type == TempoMap::Bar)  {
                                    if ((*i).bar % 4 == 1) {
                                          snprintf (buf, sizeof(buf), "%" PRIu32, (*i).bar);
                                          (*marks)[n].style = GtkCustomRulerMarkMajor;
                                    } else {
                                          snprintf (buf, sizeof(buf), " ");
                                    if ((*i).bar % 4 == 3)  {
                                          (*marks)[n].style = GtkCustomRulerMarkMinor;
                                    } else {
                                                (*marks)[n].style = GtkCustomRulerMarkMicro;
                                    }
                                    }
                                    (*marks)[n].label = g_strdup (buf);
                                    (*marks)[n].position = (*i).frame;
                                    n++;
                              }
                  }
            }
            delete zoomed_bbt_points;
            return nmarks;
      }
}

gint
Editor::metric_get_frames (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      jack_nframes_t mark_interval;
      jack_nframes_t pos;
      gchar buf[16];
      gint nmarks;
      gint n;

      if (session == 0) {
            return 0;
      }

      mark_interval = (upper - lower) / 5;
      if (mark_interval > session->frame_rate()) {
            mark_interval -= mark_interval % session->frame_rate();
      } else {
            mark_interval = session->frame_rate() / (session->frame_rate() / mark_interval ) ;
      }
      nmarks = 5;
      *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
      for (n = 0, pos = lower; n < nmarks; pos += mark_interval, ++n) {
            snprintf (buf, sizeof(buf), "%u", pos);
            (*marks)[n].label = g_strdup (buf);
            (*marks)[n].position = pos;
            (*marks)[n].style = GtkCustomRulerMarkMajor;
      }
      
      return nmarks;
}

static void
sample_to_clock_parts ( jack_nframes_t sample,
                  jack_nframes_t sample_rate, 
                  long *hrs_p,
                  long *mins_p,
                  long *secs_p,
                  long *millisecs_p)

{
      jack_nframes_t left;
      long hrs;
      long mins;
      long secs;
      long millisecs;
      
      left = sample;
      hrs = left / (sample_rate * 60 * 60);
      left -= hrs * sample_rate * 60 * 60;
      mins = left / (sample_rate * 60);
      left -= mins * sample_rate * 60;
      secs = left / sample_rate;
      left -= secs * sample_rate;
      millisecs = left * 1000 / sample_rate;

      *millisecs_p = millisecs;
      *secs_p = secs;
      *mins_p = mins;
      *hrs_p = hrs;

      return;
}

gint
Editor::metric_get_minsec (GtkCustomRulerMark **marks, gulong lower, gulong upper, gint maxchars)
{
      jack_nframes_t range;
      jack_nframes_t fr;
      jack_nframes_t mark_interval;
      jack_nframes_t pos;
      jack_nframes_t spacer;
      long hrs, mins, secs, millisecs;
      gchar buf[16];
      gint nmarks;
      gint n;
      gint mark_modulo = 100;
      bool show_seconds = false;
      bool show_minutes = false;
      bool show_hours = false;

      if (session == 0) {
            return 0;
      }

      fr = session->frame_rate();

      /* to prevent 'flashing' */
      if (lower > (spacer = (jack_nframes_t)(128 * Editor::get_current_zoom ()))) {
            lower = lower - spacer;
      } else {
            upper = upper + spacer;
            lower = 0;
      }
      range = upper - lower;

      if (range <  (fr / 50)) {
            mark_interval =  fr / 100; /* show 1/100 seconds */
            mark_modulo = 10;
      } else if (range <= (fr / 10)) { /* 0-0.1 second */
            mark_interval = fr / 50; /* show 1/50 seconds */
            mark_modulo = 20;
      } else if (range <= (fr / 2)) { /* 0-0.5 second */
            mark_interval = fr / 20;  /* show 1/20 seconds */
            mark_modulo = 100;
      } else if (range <= fr) { /* 0-1 second */
            mark_interval = fr / 10;  /* show 1/10 seconds */
            mark_modulo = 200;
      } else if (range <= 2 * fr) { /* 1-2 seconds */
            mark_interval = fr / 2; /* show 1/2 seconds */
            mark_modulo = 500;
      } else if (range <= 8 * fr) { /* 2-5 seconds */
            mark_interval =  fr / 5; /* show 2 seconds */
            mark_modulo = 1000;
      } else if (range <= 16 * fr) { /* 8-16 seconds */
            mark_interval =  fr; /* show 1 seconds */
            show_seconds = true;
            mark_modulo = 5;
      } else if (range <= 30 * fr) { /* 10-30 seconds */
            mark_interval =  fr; /* show 10 seconds */
            show_seconds = true;
                mark_modulo = 5;
      } else if (range <= 60 * fr) { /* 30-60 seconds */
                mark_interval = 5 * fr; /* show 5 seconds */
                show_seconds = true;
                mark_modulo = 3;
        } else if (range <= 2 * 60 * fr) { /* 1-2 minutes */
                mark_interval = 5 * fr; /* show 5 seconds */
                show_seconds = true;
                mark_modulo = 3;
        } else if (range <= 4 * 60 * fr) { /* 4 minutes */
                mark_interval = 10 * fr; /* show 10 seconds */
                show_seconds = true;
                mark_modulo = 30;
        } else if (range <= 10 * 60 * fr) { /* 10 minutes */
                mark_interval = 30 * fr; /* show 30 seconds */
                show_seconds = true;
                mark_modulo = 60;
        } else if (range <= 30 * 60 * fr) { /* 10-30 minutes */
                mark_interval =  60 * fr; /* show 1 minute */
                show_minutes = true;
            mark_modulo = 5;
        } else if (range <= 60 * 60 * fr) { /* 30 minutes - 1hr */
                mark_interval = 2 * 60 * fr; /* show 2 minutes */
                show_minutes = true;
                mark_modulo = 10;
        } else if (range <= 4 * 60 * 60 * fr) { /* 1 - 4 hrs*/
                mark_interval = 5 * 60 * fr; /* show 10 minutes */
                show_minutes = true;
                mark_modulo = 30;
        } else if (range <= 8 * 60 * 60 * fr) { /* 4 - 8 hrs*/
                mark_interval = 20 * 60 * fr; /* show 20 minutes */
                show_minutes = true;
                mark_modulo = 60;
        } else if (range <= 16 * 60 * 60 * fr) { /* 16-24 hrs*/
                mark_interval =  60 * 60 * fr; /* show 60 minutes */
                show_hours = true;
            mark_modulo = 2;
        } else {
                                                                                                                   
                /* not possible if jack_nframes_t is a 32 bit quantity */
                                                                                                                   
                mark_interval = 4 * 60 * 60 * fr; /* show 4 hrs */
        }

      nmarks = 1 + (range / mark_interval);
      *marks = (GtkCustomRulerMark *) g_malloc (sizeof(GtkCustomRulerMark) * nmarks);
      pos = ((lower + (mark_interval/2))/mark_interval) * mark_interval;
      
      if (show_seconds) {
            for (n = 0; n < nmarks; pos += mark_interval, ++n) {
                  sample_to_clock_parts (pos, fr, &hrs, &mins, &secs, &millisecs);
                        if (secs % mark_modulo == 0) {
                        if (secs == 0) {
                              (*marks)[n].style = GtkCustomRulerMarkMajor;
                        } else {
                              (*marks)[n].style = GtkCustomRulerMarkMinor;
                        }
                        snprintf (buf, sizeof(buf), "%02ld:%02ld:%02ld.%03ld", hrs, mins, secs, millisecs);
                  } else {
                              snprintf (buf, sizeof(buf), " ");
                              (*marks)[n].style = GtkCustomRulerMarkMicro;
                    }
                  (*marks)[n].label = g_strdup (buf);
                        (*marks)[n].position = pos;
            }
        } else if (show_minutes) {
            for (n = 0; n < nmarks; pos += mark_interval, ++n) {
                        sample_to_clock_parts (pos, fr, &hrs, &mins, &secs, &millisecs);
                        if (mins % mark_modulo == 0) {
                                if (mins == 0) {
                                        (*marks)[n].style = GtkCustomRulerMarkMajor;
                                } else {
                                        (*marks)[n].style = GtkCustomRulerMarkMinor;
                                }
                        snprintf (buf, sizeof(buf), "%02ld:%02ld:%02ld.%03ld", hrs, mins, secs, millisecs);
                        } else {
                                snprintf (buf, sizeof(buf), " ");
                                (*marks)[n].style = GtkCustomRulerMarkMicro;
                        }
                        (*marks)[n].label = g_strdup (buf);
                        (*marks)[n].position = pos;
                }
        } else if (show_hours) {
             for (n = 0; n < nmarks; pos += mark_interval, ++n) {
                        sample_to_clock_parts (pos, fr, &hrs, &mins, &secs, &millisecs);
                        if (hrs % mark_modulo == 0) {
                                (*marks)[n].style = GtkCustomRulerMarkMajor;
                                snprintf (buf, sizeof(buf), "%02ld:%02ld:%02ld.%03ld", hrs, mins, secs, millisecs);
                        } else {
                                snprintf (buf, sizeof(buf), " ");
                                (*marks)[n].style = GtkCustomRulerMarkMicro;
                        }
                        (*marks)[n].label = g_strdup (buf);
                        (*marks)[n].position = pos;
                }
        } else {
            for (n = 0; n < nmarks; pos += mark_interval, ++n) {
                  sample_to_clock_parts (pos, fr, &hrs, &mins, &secs, &millisecs);
                  if (millisecs % mark_modulo == 0) {
                        if (millisecs == 0) {
                              (*marks)[n].style = GtkCustomRulerMarkMajor;
                        } else {
                              (*marks)[n].style = GtkCustomRulerMarkMinor;
                        }
                        snprintf (buf, sizeof(buf), "%02ld:%02ld:%02ld.%03ld", hrs, mins, secs, millisecs);
                  } else {
                        snprintf (buf, sizeof(buf), " ");
                        (*marks)[n].style = GtkCustomRulerMarkMicro;
                  }
                  (*marks)[n].label = g_strdup (buf);
                  (*marks)[n].position = pos;
            }
      }

      return nmarks;
}

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